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Segmented Information - Capital Expenditures (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Exploration and evaluation assets    
Net expenditures $ 1 $ 5
Non-cash and fair value changes (186) (147)
Capitalized  costs (185) (142)
Property, plant and    equipment    
Net expenditures 4,492 2,555
Non-cash and fair value changes 782 (271)
Capitalized  costs 5,274 2,284
Net expenditures 4,493 2,560
Total capitalised costs 5,089 2,142
Total non-cash and fair value changes $ 596 (418)
Percentage of net carried interest 5.00%  
Head office    
Property, plant and    equipment    
Net expenditures $ 23 19
Non-cash and fair value changes 0 0
Capitalized  costs 23 19
Exploration and    Production | Operating segments    
Property, plant and    equipment    
Net expenditures 2,713 1,208
Non-cash and fair value changes 1,383 357
Capitalized  costs 4,096 1,565
North America | Operating segments    
Exploration and evaluation assets    
Net expenditures (7) (7)
Non-cash and fair value changes (36) (150)
Capitalized  costs (43) (157)
Property, plant and    equipment    
Net expenditures 2,486 999
Non-cash and fair value changes 1,351 371
Capitalized  costs 3,837 1,370
North Sea | Operating segments    
Property, plant and    equipment    
Net expenditures 173 122
Non-cash and fair value changes 38 (21)
Capitalized  costs 211 101
Offshore Africa | Operating segments    
Exploration and evaluation assets    
Net expenditures 8 12
Non-cash and fair value changes 0 3
Capitalized  costs 8 15
Property, plant and    equipment    
Net expenditures 54 87
Non-cash and fair value changes (6) 7
Capitalized  costs 48 94
Oil Sands Mining and Upgrading | Operating segments    
Exploration and evaluation assets    
Net expenditures 0 0
Non-cash and fair value changes (150) 0
Capitalized  costs (150) 0
Property, plant and    equipment    
Net expenditures 1,747 1,323
Non-cash and fair value changes (601) (629)
Capitalized  costs 1,146 694
Midstream and Refining | Operating segments    
Property, plant and    equipment    
Net expenditures 9 5
Non-cash and fair value changes 0 1
Capitalized  costs 9 6
STORM Resources Ltd    
Property, plant and    equipment    
Total purchase consideration $ 771  
Painted Pony Energy Ltd    
Property, plant and    equipment    
Total purchase consideration   $ 111